the launch options arent coming up again, i cant turn them back on...

I've tried various approaches but wasn't able to reproduce the issue in my environment, so I've updated the patch to generate log files for investigation.
You can enable logging by opening TerraTech's properties in your Steam library and entering "+mpmodpatch_log=error" in the Launch Options. This will create a mpmodpatch_log.txt file in the %USERPROFILE%\AppData\LocalLow\Payload\TerraTech folder.
If you could email this file to me (snocream1446@gmail.com), I might be able to help identify what's causing the problem.

friend not able to find my game while even with this in the game...

My friend is also having the same issue, changing the crossplay setting doesn't change anything either.

Does this happen on all modes? Also, does it still happen after turning on/off crossplay, and uninstalling/reinstalling this patch?

when*

Ihen I try to mod multiplayer with my friends I always get stuck in the lobby for some reason, does anyone know how to fix this?

I have found out that that code segment I linked is what's in in community patch. I will add a copy for SkinIDsByCorp, but otherwise leave it as-is. Mod loading order should be deterministic based on what 0MM sees, unless there's weird scenarios where mods with strange dependencies are removed after the save is created. I will not add handling for save games, though, since this mod and save translator already handle that

ModSessionInfo.SkinIDs was used in the past, but not in the current version.
Therefore, instead of SkinIDs, SkinIDsByCorp must be changed to make modded skins available.

Also, as you can see by comparing with the singleplayer mode loading process, simply copying from m_CurrentSession will not correctly load the mod information in the existing save, unless the mods used have not changed since the save data was created (The order in which the mods were added is also relevant).

(I used a translation tool.)

Seeing this has reminded me. I have an equivalent that just overwrites the new session commented out here: https://github.com/FLSoz/TerraTechModLoader/blob/main/ModManager/src/patches/MultiplayerPatches.cs#L152-L203

You folks have any idea why I might have left it commented out? I don't remember

The conflict with the community patch was the problem. It is fixed it for me. Thanks.

Fixed a conflict with Community patch .
The error seemed to occur when using custom corps and blocks as well as skins.

If you have mods from outside Steam Workshop, could you please uninstall them and try again?
Or could you tell me what mods you are using?

It is crashing when I make a new co-op campaign world. The game instantly crashes when I push the play button. Also, I don't have a save because I can't even make a new world.

I haven't yet been able to reproduce the crash, but I have fixed what I believe to be the cause of the crash.
If this does not solve the problem, it might be difficult to fix without the save file that causes the crash.

I use a lot of skins and block mods, some of which I made myself. Also, the game crashes on old and new saves.

Thanks for the report.
It did not crash in my environment with only this mod installed.
Could you please let me know if you have any other mods installed?
Also, if you have any save file that is crashing, could you please send it to me? (snocream1446@gmail.com)
The save files can be found at:
C:\Users\{UserName}\Documents\My Games\TerraTech\{UserID}\Saves\{ProfileName}\CoopCampaign

Yeah, I'm having a similar problem. I can't enter old co-op worlds, but I can't create new ones either. Fix this bug please.

Hi, when start a co-op campaign world, the game instantly crashes and closes. this only happens with your mod installed, can you update the mod to prevent this?